Ummmmm The Shallows
That's why I said "as a rule" lol. The first time I saw the Shallows I couldn't tell if a real shark was used for much of the film so if the CGI is *that* good then yeah I'm fine with it. Even though it wasn't a great film were the sharks CG in 47 Meters Down? If so then they might have even been more believable than the one in The Shallows.
I also remember being impressed with the bear in The Revenant. Honestly unless you're going to hit that level of quality then just go back to "not showing the animal" a la 1975 Spielberg. I'll still catch Crawl though because I like "people getting eaten by animals" movies, lol.